CN101205702A - Beam and mold combined mobile formwork - Google Patents

Abstract

The invention discloses a beam-mold type movable die carrier which is large-scale construction equipment used in the construction of box beams of upper structures of bridges of railways and highways. A load-bearing beam of the movable die carrier is a special cross-section steel box, a top plate and an inner web of the movable die carrier are taken as external molds of a concrete box beam; a bottom die adopts a low height orthotropic plate structure and is opened and closed by single-side horizontal push. The beam-mold type movable die carrier is particularly suitable for construction under wide pier shaft conditions.

Description

Beam and mold combined mobile formwork

Technical field

The invention relates to a bridge engineering superstructure box girder construction technology, in particular to a beam-mold-integrated mobile formwork used in cast-in-place concrete box girders.

Background technique

The technology of pouring concrete box girder with moving formwork has been widely used in our country. The formwork system and load-bearing beam system of conventional mobile formwork are separated. When traveling through the hole, the formwork system (especially the bottom formwork system) will be divided into two in the direction of the bridge, and they will be moved to the pier body on both sides. Outside the width range, use the gaps on both sides of the pier body to pass through. The prerequisite for the above-mentioned mobile formwork construction to be realized is that the width of the pier body is similar to the width of the bottom plate of the concrete box girder. For bridges whose pier body width is much larger than that of the concrete box girder bottom plate, the hole-through technology of conventional mobile formwork will not be able to adapt, even if it is barely done, it will greatly increase the construction cost and construction difficulty.

Contents of Invention

The purpose of the present invention is to address the above shortcomings, in order to meet the construction of wide pier bridges, and fully combine the structural characteristics of the main body, to provide a new type of mobile formwork with simple structure, clear force, easy operation, complete functions, safety and reliability.

The way to realize the object of the present invention is a beam-mold-integrated mobile formwork. The formwork is mainly composed of load-bearing main beams, guide beams, supporting devices, formwork systems, bottom mold opening and closing systems, vertical and horizontal movement systems and auxiliary structures.

The load-bearing main girder adopts a special-shaped steel box, and its top plate and inner inclined web are consistent with the outline of the concrete box girder, so in addition to load-bearing, it also has the function of an outer mold; the load-bearing main girder is manufactured in several segments, and the segments are connected by bolts , The steel box has its own anti-arch.

The guide beam is welded into a truss structure by section steel.

The supporting device adopts self-locking jacks, and the self-weight of the concrete box girder and the construction load are borne by the jacks when the beams are made, and the lowering of the formwork is also completed.

Formwork system 4 mainly includes bottom formwork and wing plate formwork. Due to the limitation of the height between the bottom of the concrete box girder and the top of the pier, the bottom formwork must go over the top of the pier for automatic opening. Based on this, the bottom formwork adopts a low-height large orthotropic plate structure, and long slideways are installed on both sides of the bottom formwork for the bottom formwork. Used for opening and closing. The bottom formwork and the main beam are connected by shear bolts and shear pins.

The bottom mold opening and closing system includes the bottom mold lateral movement hydraulic jack, jack support and reversing system, jack connecting seat and hanging roller, etc. When passing through the hole, the bottom mold opens horizontally to one side, and resets after passing through the pier.

The vertical and horizontal moving system includes two devices for vertical and horizontal movement.

Auxiliary structures include small door cranes, running tracks and operating baskets.

The mobile formwork can be used for reference in the in-situ pouring construction of simply supported box girders with equal heights and continuous box girders.

The technical characteristics of beam-mold-integrated mobile formwork are distinct, which are summarized as follows:

(1) Adapt to wide pier bridge construction

Successfully solved the technical problem of moving the formwork through the hole under the condition of ultra-wide pier body.

(2) Combination of beam and mold

It is the first application at home and abroad that the beam-formwork structure is combined into one mobile formwork.

(3) Low thickness bottom mold and drawer type opening and closing

The bottom formwork is small in thickness and can be opened and closed horizontally, which can make full use of the limited space between the concrete box girder and the top of the pier.

(4) No outrigger structure, less investment and simplified process.

(5) Default camber

The main beam is set with an upper arch to make the line shape of the concrete beam better.

(6) Template condition is good

The formwork has large surface area, fewer joints, high rigidity, and small gaps, greatly reducing potential quality hazards such as slurry leakage, wrong platform, and honeycomb pockmarks, and the finished beam is solid inside and outside.

(7) High rigidity and light weight

(8) Less external template work

The mold can be automatically demoulded by operating the main beam supporting jack, and the outer mold will be in place synchronously when the main beam reaches the designed position. Reduce manual demoulding, template adjustment and other processes.

(9) The working surface is wide

The open working surface is equipped with a movable door machine, and the steel bars and inner molds can be hoisted as a whole, which is beneficial to shorten the working cycle.

Description of drawings

Figure 1 Elevation view of mobile formwork

Figure 2 Plane view of mobile formwork

Figure 3a Sectional view of the top of the mobile formwork pier (concrete pouring state)

Figure 3b Sectional view of the pier top of the mobile formwork (in the longitudinal state)

Figure 3c cross-sectional view of the mobile formwork (concrete pouring state)

Figure 3d cross-sectional view of the mobile formwork (demoulding state)

Figure 4 Sectional view of the load-bearing main beam of the mobile formwork

Figure 5 Mobile formwork main beam connection structure diagram

Figure 6 Bottom mold structure diagram

Figure 7a～Figure 7d Construction steps of bottom formwork opening and closing

Figure 8-16 Construction steps of mobile formwork

In the figure: 1-load-bearing main beam, 2-guide beam, 3-supporting device, 4-formwork system, 5-bottom mold opening and closing system, 6-vertical and lateral movement system, 7-auxiliary structure.

Detailed ways

1 and 2, the mobile formwork is composed of load-bearing main beam 1, guide beam 2, supporting device 3, formwork system 4, bottom mold opening and closing system 5, vertical and horizontal movement system 6 and auxiliary structure 7.

Referring to Fig. 3a, the main girder 1 of the mobile formwork is supported on the top of the pier through the supporting device 3. The door crane of the auxiliary structure 7 is arranged above the mobile formwork.

Referring to Fig. 3b, when the mobile formwork moves vertically, the bottom form 4 is opened horizontally through the bottom form opening and closing system 5, so as to avoid the bridge support pad stone on the top of the pier.

Referring to Fig. 3c, when the concrete of the box girder is poured, the bottom form 4 is hung on the main beam 1 by the suspender 8; the bottom form opening system 5 is attached to one side of the main beam 1.

Referring to Fig. 3d, when demoulding, the main girder 1 descends together with the bottom form 4 and separates from the concrete box girder.

Referring to Fig. 4, the top plate 9 of the main girder 1 and the web plate 10 on one side are arranged obliquely according to the shape of the concrete box girder.

Referring to Fig. 5, the connection between the manufacturing segments of the main beam 1, the top plate 9 and the web 10 of the load-bearing beam 1 used as the formwork surface are connected by inner flange bolts; the rest are connected by gusset plate shear bolts.

Referring to FIG. 6 , the bottom mold 4 adopts a low-height orthotropic plate, and slideways are arranged on both sides thereof so as to slide and open to one side.

Referring to Fig. 7a, the piston rod of the hydraulic cylinder of the bottom mold opening and closing system 5 is stretched out, and connected with the bottom mold 4 through a sliding seat.

Referring to Fig. 7b, the piston rod of the hydraulic cylinder is retracted, and the bottom mold 4 is dragged to slide horizontally to one side.

Referring to Fig. 7c, when the bottom mold is half opened, the hydraulic cylinder is rotated 180° and connected with the bottom mold 4 again.

Referring to Fig. 7d, the hydraulic oil cylinder pushes and continues to slide the bottom mold 4 to one side until it is fully opened.

With reference to Fig. 8, each part structure of mobile formwork is installed on the support as a whole.

Referring to Fig. 9, the steel bars of the concrete box girder are bound, the prestressed beams are worn, and the box girder concrete is poured and maintained.

Referring to Figure 10, the prestressed beams of the tensioned concrete box girder are anchored, grouted, and anchored.

Referring to Fig. 11, the mobile formwork is lowered and demoulded as a whole, and the longitudinal and lateral movement system 6 is installed.

With reference to Fig. 12, start the longitudinal and lateral movement system 6, and the traction mobile formwork slides forward.

Referring to Fig. 13, the mobile formwork moves longitudinally to the next span construction position.

Referring to Figure 14, continue the construction of the concrete box girders until all the concrete box girders are completed.

Claims (3)

1. Beam and mold integrated mobile formwork, characterized in that: the main load-bearing beam of the mobile formwork and a part of the outer formwork structure are combined into one, the main load-bearing beam of the mobile formwork adopts a steel box girder with a special-shaped section, and its top plate and one side The web is arranged obliquely, and it is also used as the external formwork of the concrete box girder. Steel box girders with special-shaped sections are connected in the following way: the roof and web of steel box girders with oblique arrangement are connected by inner flanges and tension bolts; the bottom plate and vertical web of steel box girders are connected by gusset plates and shear force Bolted. 2. The beam-mold-integrated mobile formwork according to claim 1, characterized in that the bottom formwork adopts low-height orthotropic plates, and the two ends are connected with the steel box girder. On the box girder, slide horizontally to one side. 3. The beam-mold-integrated mobile formwork according to claim 1, wherein when the bottom form is opened horizontally, the hydraulic cylinder first pulls and then pushes, during which the hydraulic cylinder rotates 180° around its hanging point.

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